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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Main page</title>
    <link rel="stylesheet" type="text/css" href="css/main.css" title="main">
    <link rel="stylesheet" type="text/css" href="css/main_sea.css" title="sea">
    <link rel="alternate stylesheet" type="text/css" href="css/main_sun.css" title="sun">
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<body>
    <div calss="container">
        <div class="container header">
            <a>随便什么管理系统</a>
        </div>
        <div class="container pagebody">
            <!-- 左侧菜单导航 -->
            <div class="menu">
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">首页</div>
                </div>
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">主题</div>
                    <!--子标题-->
                    <div class="menu_content">
                        <a href="#" rel="sea">海洋</a>
                        <a href="#" rel="sun">阳光</a>
                    </div>
                </div>
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">用户管理</div>
                </div>
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">文章管理</div>
                </div>
            </div>
            <!-- 右侧内容 -->
            <div class="content">
                <a>欢迎使用</a>
            </div>
        </div>
        <div class="container footer">
            <p>xiaolongxibao @ 2023</p>
        </div>
    </div>
</body><html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Main page</title>
    <link rel="stylesheet" type="text/css" href="css/main.css" title="main">
    <link rel="stylesheet" type="text/css" href="css/main_sea.css" title="sea">
    <link rel="alternate stylesheet" type="text/css" href="css/main_sun.css" title="sun">
    <script src="https://static.runoob.com/assets/jquery-validation-1.14.0/lib/jquery.js"></script>
    <script src="https://static.runoob.com/assets/jquery-validation-1.14.0/dist/jquery.validate.min.js"></script>
    <script src="https://static.runoob.com/assets/jquery-validation-1.14.0/dist/localization/messages_zh.js"></script>
    <script src="js/main.js"></script>
</head>

<body>
    <div calss="container">
        <div class="container header">
            <a>随便什么管理系统</a>
        </div>
        <div class="container pagebody">
            <!-- 左侧菜单导航 -->
            <div class="menu">
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">首页</div>
                </div>
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">主题</div>
                    <!--子标题-->
                    <div class="menu_content">
                        <a href="#" rel="sea">海洋</a>
                        <a href="#" rel="sun">阳光</a>
                    </div>
                </div>
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">用户管理</div>
                </div>
                <!--每一个菜单栏项-->
                <div class="menu_item">
                    <!--主标题-->
                    <div class="menu_title">文章管理</div>
                </div>
            </div>
            <!-- 右侧内容 -->
            <div class="content">
                <a>欢迎使用</a>
            </div>
        </div>
        <div class="container footer">
            <p>xiaolongxibao @ 2023</p>
        </div>
    </div>
</body>

</html>